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0 <br /> TABLE 1 <br /> GROUNDWATER ELEVATION AND ANALYTICAL SUMMARY <br /> ARCO Service Station No 5469 <br /> 130 South Wilson Way,Stockton,California <br /> Elevation Top of Well Static Water Groundwater Groundwater Ethyl- Total <br /> Well Top of Casing Screen Uvel Elevation Flow TPHG Benzene Toluene benzene Xylenes MTBE[l] QA/QC <br /> Number Date feet msl (feet b feet b (feet msl) Direction Eg& 9—L 991L µ µ Review <br /> NOTES <br /> ]1]MIKE was analyzed using USEPA Method 8020 TPHG=Total petroleum hydrocarbons as gasoline QA/QC Review <br /> [21 MTBE was analyzed using US£PA Method 8260 MTBE=Methyl tert butyi ether A=Data accepted without qualification <br /> [31 The value reported exceeds the calibration curve,but not the linear range NA=Not analyzed 1=Data accepted with qualification <br /> 141 Chromatogram Pattern Weathered Gasoline C6 C12 NC=Not calculated R=Data rejected <br /> [5)The reporting limits for this sample have been raised due to the high level of a target compound NS=Not sampled <br /> [61 The reporting limit(s)for this sample have been raised due to high levels of non target mteferents msl=mean sea level <br /> [71 Sample was diluted due to high levels of Benzene bgs=below ground surface <br /> [8]Hydrocarbon pattern is present in the requested fuel quantitation range but does not resemble the pattern of the requested fi pg/L=micrograms per liter <br /> 91 Sample was reanalyzed past EPA recommended holding time <=Below detection limit for the analytical methods used <br /> [101 The sample was diluted due to the presence of high levels of target analytes resulting in elevated reporting limits <br /> [t 11 Laboratory report indicates discrete peak at MTBE and Benzene <br /> [12]Laboratory report indicates discrete peak at MTBE <br /> 131 The concentration indicated for this analyte is an estimated value above the calibration range of the instrument , <br /> [14]This sample was analyzed beyond the EPA recommended holding time <br /> [15]Based on notes in laboratory report and conversation with laboratory(I 1/19102) this TPHG result is due entirely to presence ofMfBE No other compounds eluted in the TPHG range (Refer to Stratus' <br /> anerly Groundwater Monitoring Report Third Quarter 2002 dated November 20 2002) <br /> 116)The continuing calibration standard was outside of the acceptance entena <br /> [171 The sample was diluted due to the presence of lugh levels of non target analytes resulting in elevated reporting limits <br /> {18]Discrete peak®C6 C7 <br /> [19]Reported result is due to a discrete peak at C5 and has been rejected <br /> [20]Anaiyte was also reported in the associated laboratory blank as well as in the sample Result should be considered not detected <br /> [21]Initial results maybe biased high as shown by surrogate recoveries above method acceptance limits(due to matrix interference) Sample reanalyzed outside of EPA recommended hold time Initial result reported in the table,and should be <br /> I <br /> considered an estimate <br /> [22]Initial result was an estimate,beyond the calibration range of the instrument Sample re-analyzed beyond the EPA recommended hold time Initial result reported in the table <br /> [23j The reported results may be biased low since the analyses for these analytes were performed beyond the EPA recommended holding time of 14 days <br /> [241 The reported results may be biased low as demonstrated by a low surmgate recovery due to matrix interference <br /> [251 Initial result not confirmed by re-analysts Re-analysis performed beyond hold time Initial result reported in the table,should be considered an estimate <br /> STRATUS <br /> Arco_5469_Quarterly_Data <br /> 9of9 <br />